{"id":15446,"date":"2025-07-24T12:34:26","date_gmt":"2025-07-24T12:34:26","guid":{"rendered":"https:\/\/sistc.com\/?p=15446"},"modified":"2025-07-24T12:34:28","modified_gmt":"2025-07-24T12:34:28","slug":"en-blog-microphone-sensitivity-guide","status":"publish","type":"post","link":"https:\/\/sistc.com\/zh\/en-blog-microphone-sensitivity-guide\/","title":{"rendered":"\u4e86\u89e3\u9ea6\u514b\u98ce\u7075\u654f\u5ea6\uff1a\u4f18\u5316\u97f3\u9891\u6027\u80fd\u7684\u5173\u952e\u53c2\u6570"},"content":{"rendered":"<h3 class=\"wp-block-heading\"><strong>\u7b80\u4ecb\uff1a\u4ec0\u4e48\u662f\u9ea6\u514b\u98ce\u7075\u654f\u5ea6\uff0c\u4e3a\u4ec0\u4e48\u5b83\u5f88\u91cd\u8981\uff1f<\/strong><\/h3><p>\u9ea6\u514b\u98ce\u662f\u4e00\u79cd\u538b\u654f\u4f20\u611f\u5668\uff0c\u53ef\u5c06\u58f0\u6ce2\u8f6c\u6362\u4e3a\u7535\u4fe1\u53f7\u3002\u7075\u654f\u5ea6\u51b3\u5b9a\u4e86\u4f20\u58f0\u5668\u6355\u6349\u4f4e\u58f0\u538b (SPL) \u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u7535\u538b\uff08\u6a21\u62df\uff09\u6216\u6570\u5b57\u8f93\u51fa\u7684\u6548\u7387\u3002\u5b83\u662f <strong>\u6700\u5173\u952e\u7684\u89c4\u683c<\/strong> \u5728\u8bc4\u4f30\u667a\u80fd\u5bb6\u5c45\u3001\u79fb\u52a8\u6216\u5de5\u4e1a\u97f3\u9891\u5e94\u7528\u7684 MEMS \u9ea6\u514b\u98ce\u65f6\u3002<\/p><p>\u5728 <a class=\"\" href=\"https:\/\/sistc.com\/zh\/\">\u65e0\u9521\u7845\u6e90\u79d1\u6280\u6709\u9650\u516c\u53f8<\/a>\u6211\u4eec\u4e13\u6ce8\u4e8e <strong>MEMS \u9ea6\u514b\u98ce<\/strong> \u8bbe\u8ba1\u7528\u4e8e\u5404\u79cd\u8bed\u97f3\u63a5\u53e3\u573a\u666f--\u4ece\u8fd1\u573a\u667a\u80fd\u8bbe\u5907\u5230\u8fdc\u573a\u4f1a\u8bae\u7cfb\u7edf\u3002\u5728\u672c\u535a\u5ba2\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u89e3\u91ca\u7075\u654f\u5ea6\u89c4\u683c\u3001\u6bd4\u8f83\u6a21\u62df\u548c\u6570\u5b57\u8bdd\u7b52\uff0c\u5e76\u5e2e\u52a9\u60a8\u4e3a\u81ea\u5df1\u7684\u8bbe\u8ba1\u505a\u51fa\u6b63\u786e\u7684\u9009\u62e9\u3002<\/p><h3 class=\"wp-block-heading\"><strong>\u5b9a\u4e49\u7075\u654f\u5ea6\uff1adBV vs dBFS<\/strong><\/h3><h4 class=\"wp-block-heading\">\ud83d\udd39 <strong>\u53c2\u8003\u58f0\u7ea7\uff1a94 dB SPL<\/strong><\/h4><p>\u5927\u591a\u6570\u9ea6\u514b\u98ce\u7684\u7075\u654f\u5ea6\u989d\u5b9a\u503c\u57fa\u4e8e <strong>94 \u5206\u8d1d\u58f0\u538b\u7ea7<\/strong> \u8f93\u5165\uff0c\u5bf9\u5e94\u4e8e <strong>1 \u5e15\u65af\u5361<\/strong> \u538b\u529b\u6ce2\u3002\u8be5\u503c\u6765\u81ea<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>dBSPL = 20 \u00d7 log(P\/P\u2080)\uff0c\u5176\u4e2d P\u2080 = 20 \u03bcPa<br>\u21d2 20 \u00d7 log(1 Pa \/ 20 \u03bcPa) = <strong>94 dBSPL<\/strong><\/p><\/blockquote><h3 class=\"wp-block-heading\"><strong>\u6a21\u62df\u9ea6\u514b\u98ce\u7075\u654f\u5ea6<\/strong><\/h3><p>\u6a21\u62df MEMS \u9ea6\u514b\u98ce\u7684\u7075\u654f\u5ea6\u4ee5\u4e0b\u5217\u5355\u4f4d\u8868\u793a <strong>\u5206\u8d1d\/\u5e15<\/strong>\u5176\u4e2d 0 dBV = 1 V RMS \u8f93\u51fa\u3002<\/p><ul class=\"wp-block-list\"><li><strong>\u8ba1\u7b97\u516c\u5f0f<\/strong>:<br><code>\u7075\u654f\u5ea6 (dBV) = 20 \u00d7 log10\uff08\u8f93\u51fa\u7535\u538b\/1 V\uff09<\/code><\/li>\n\n<li>\u4e3e\u4f8b\u8bf4\u660e\uff1a\u8f93\u51fa\u4e3a 10 mV\/Pa \u7684\u8bdd\u7b52 \u2192 10 mV\/Pa<br><code>20 \u00d7 log10(0.01 \/ 1) = -40 dBV<\/code><\/li><\/ul><p>\u6a21\u62df\u8bdd\u7b52\u53d7\u76ca\u4e8e\u524d\u7aef\u589e\u76ca\u8c03\u6574\u3002\u4f8b\u5982\uff0c\u5982\u679c\u50cf ADMP504 \u8fd9\u6837\u7684\u6a21\u62df MEMS \u9ea6\u514b\u98ce\u80fd\u8f93\u51fa <strong>0.25 V \u5cf0\u503c<\/strong>, a <strong>12 \u5206\u8d1d\u589e\u76ca\uff08\u00d74\uff09<\/strong> \u4f7f\u5176\u4e0e <strong>1.0 V ADC \u6ee1\u91cf\u7a0b\u8f93\u5165<\/strong>\u4fdd\u6301\u4fe1\u53f7\u8d28\u91cf\u3002<\/p><figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"734\" height=\"448\" src=\"https:\/\/sistc.com\/wp-content\/uploads\/2025\/07\/Analog-mics-benefit-from-front-end-gain-tuning.png\" alt=\"\" class=\"wp-image-15447\" srcset=\"https:\/\/sistc.com\/wp-content\/uploads\/2025\/07\/Analog-mics-benefit-from-front-end-gain-tuning.png 734w, https:\/\/sistc.com\/wp-content\/uploads\/2025\/07\/Analog-mics-benefit-from-front-end-gain-tuning-300x183.png 300w, https:\/\/sistc.com\/wp-content\/uploads\/2025\/07\/Analog-mics-benefit-from-front-end-gain-tuning-18x12.png 18w, https:\/\/sistc.com\/wp-content\/uploads\/2025\/07\/Analog-mics-benefit-from-front-end-gain-tuning-600x366.png 600w\" sizes=\"(max-width: 734px) 100vw, 734px\" \/><\/figure><p>\ud83d\udccc<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"> <a href=\"https:\/\/sistc.com\/zh\/blog-analog-vs-digital-mems-microphone-design\/\">\u4e86\u89e3\u6211\u4eec\u7684\u6a21\u62df MEMS \u9ea6\u514b\u98ce\u4ea7\u54c1\u7ec4\u5408<\/a><\/mark><\/p><h3 class=\"wp-block-heading\"><strong>\u6570\u5b57\u9ea6\u514b\u98ce\u7075\u654f\u5ea6<\/strong><\/h3><p>\u6570\u5b57\u9ea6\u514b\u98ce\u6d4b\u91cf\u7075\u654f\u5ea6\u7684\u5355\u4f4d\u662f <strong>dBFS\uff08\u76f8\u5bf9\u4e8e\u6ee1\u523b\u5ea6\u7684\u5206\u8d1d\u6570\uff09<\/strong>.<\/p><ul class=\"wp-block-list\"><li><strong>\u8ba1\u7b97\u516c\u5f0f<\/strong>:<br><code>\u7075\u654f\u5ea6 (dBFS) = 20 \u00d7 log10\uff08\u8f93\u51fa\/\u6ee1\u91cf\u7a0b\uff09<\/code><\/li>\n\n<li>\u4e3e\u4f8b\u8bf4\u660e\uff1a\u6700\u5927\u58f0\u538b\u7ea7\u4e3a <strong>120 \u5206\u8d1d\u58f0\u538b\u7ea7<\/strong> \u548c 94 dB SPL \u4f5c\u4e3a\u53c2\u8003\uff1a<br><code>94 - 120 = -26 dBFS \u7075\u654f\u5ea6<\/code><\/li><\/ul><p>\u8fd9\u8868\u793a 94 dB SPL \u8f93\u5165\u6240\u4ea7\u751f\u7684\u6ee1\u523b\u5ea6\u6570\u5b57\u8f93\u51fa\u7684\u767e\u5206\u6bd4\u3002<\/p><p><strong>\u5173\u952e\u9650\u5236<\/strong>:\u6570\u5b57\u8bdd\u7b52\u5177\u6709\u56fa\u5b9a\u7684\u589e\u76ca\u548c\u7075\u654f\u5ea6\uff0c\u7531\u5176\u5185\u90e8 ADC \u548c\u4fe1\u53f7\u8def\u5f84\u51b3\u5b9a\u3002\u5b83\u4eec\u975e\u5e38\u9002\u5408\u9700\u8981\u4e00\u81f4\u6570\u5b57\u96c6\u6210\u7684\u7cfb\u7edf\u3002<\/p><p>\ud83d\udccc<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\"> <a href=\"https:\/\/sistc.com\/zh\/what-is-the-digital-output-of-a-mems-microphone\/\">\u8fdb\u4e00\u6b65\u4e86\u89e3\u6570\u5b57 MEMS \u9ea6\u514b\u98ce<\/a><\/mark><\/p><h3 class=\"wp-block-heading\"><strong>\u5982\u4f55\u9009\u62e9\u5408\u9002\u7684\u7075\u654f\u5ea6<\/strong><\/h3><p>\u7075\u654f\u5ea6\u662f <strong>\u4e0d\u662f \"\u8d8a\u9ad8\u8d8a\u597d \"\u7684\u53c2\u6570<\/strong>-\u8fd9\u53d6\u51b3\u4e8e\u5e94\u7528\u7684\u58f0\u6e90\u8ddd\u79bb\u548c\u73af\u5883\u3002<\/p><h4 class=\"wp-block-heading\"><strong>\u8fd1\u573a\u5e94\u7528<\/strong><\/h4><p>(\u5982\u667a\u80fd\u624b\u673a\u3001\u8033\u585e\u7b49\uff09<\/p><ul class=\"wp-block-list\"><li>\u4f7f\u7528 <strong>\u7075\u654f\u5ea6\u8f83\u4f4e<\/strong> \u4ee5\u907f\u514d\u5927\u97f3\u91cf\u3001\u8fd1\u8ddd\u79bb\u8f93\u5165\u9020\u6210\u524a\u6ce2\/\u5931\u771f\u3002<\/li>\n\n<li>\u65e0\u9700\u6269\u97f3\u3002<\/li><\/ul><h4 class=\"wp-block-heading\"><strong>\u8fdc\u573a\u5e94\u7528<\/strong><\/h4><p>(\u5982\u667a\u80fd\u626c\u58f0\u5668\u3001\u76d1\u63a7\u7b49\uff09<\/p><ul class=\"wp-block-list\"><li>\u4f7f\u7528 <strong>\u9ad8\u7075\u654f\u5ea6<\/strong> \u4ee5\u6355\u6349\u8870\u51cf\u7684\u8bed\u97f3\u3002<\/li>\n\n<li>\u9700\u8981\u826f\u597d\u7684\u566a\u58f0\u6ee4\u6ce2\u4ee5\u51cf\u5c11\u5e72\u6270\u3002<\/li><\/ul><h4 class=\"wp-block-heading\"><strong>\u58f0\u538b\u4e0e\u8ddd\u79bb\u7684\u7ecf\u9a8c\u6cd5\u5219<\/strong><\/h4><p>\u6bcf\u6b21\u58f0\u6e90\u8ddd\u79bb <strong>\u53cc\u500d<\/strong>\uff0c\u58f0\u538b\u7ea7 <strong>\u4e0b\u964d 6 \u5206\u8d1d<\/strong>.(\u5e73\u65b9\u53cd\u6bd4\u5b9a\u5f8b\uff09<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5230\u9ea6\u514b\u98ce\u7684\u8ddd\u79bb<\/th><th>\u58f0\u538b\u7ea7\u4e0b\u964d<\/th><\/tr><\/thead><tbody><tr><td>0.5 \u7c73 \u2192 1 \u7c73<\/td><td>-6\u5206\u8d1d<\/td><\/tr><tr><td>1 m \u2192 2 m<\/td><td>-6\u5206\u8d1d<\/td><\/tr><tr><td>2 m \u2192 4 m<\/td><td>-6\u5206\u8d1d<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><strong>\u5229\u7528\u589e\u76ca\u589e\u5f3a\u9ea6\u514b\u98ce\u4fe1\u53f7<\/strong><\/h3><p>\u65e0\u8bba\u60a8\u4f7f\u7528\u7684\u662f\u6a21\u62df\u8fd8\u662f\u6570\u5b57 MEMS \u9ea6\u514b\u98ce\u3001 <strong>\u589e\u76ca\u8c03\u6574<\/strong> \u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002<\/p><ul class=\"wp-block-list\"><li><strong>\u6a21\u62df\u8bdd\u7b52<\/strong> \u53ef\u4ee5\u4f7f\u7528\u524d\u7f6e\u653e\u5927\u5668\u7ea7\u6765\u5339\u914d\u7cfb\u7edf ADC \u8303\u56f4\u3002<\/li>\n\n<li><strong>\u6570\u5b57\u8bdd\u7b52<\/strong> \u53ef\u80fd\u9700\u8981\u8f6f\u4ef6\u4fa7\u6570\u5b57\u589e\u76ca (AGC)\uff0c\u4ee5\u4fbf\u4e0e\u4e0b\u6e38\u5904\u7406\u6216\u8bed\u97f3\u8bc6\u522b\u6a21\u578b\u4fdd\u6301\u4e00\u81f4\u3002<\/li><\/ul><p>\ud83d\udcd8 \u53e6\u8bf7\u9605\u8bfb\uff1a <a href=\"https:\/\/sistc.com\/zh\/blog-microphone-beamforming-fundamentals\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u7528\u4e8e\u667a\u80fd\u97f3\u9891\u7684\u9ea6\u514b\u98ce\u9635\u5217\u6ce2\u675f\u6210\u5f62<\/mark><\/a><\/p><h3 class=\"wp-block-heading\"><strong>\u7ed3\u8bba\uff1a\u6839\u636e\u5e94\u7528\u800c\u975e\u89c4\u683c\u8868\u8c03\u6574\u7075\u654f\u5ea6<\/strong><\/h3><p>\u7075\u654f\u5ea6\u662f\u6700 <strong>\u8bef\u89e3\u9ea6\u514b\u98ce\u89c4\u683c<\/strong>.\u9009\u62e9\u5408\u9002\u7684\u503c\u53d6\u51b3\u4e8e\u591a\u79cd\u56e0\u7d20\uff1a<\/p><ul class=\"wp-block-list\"><li>\u5230\u58f0\u6e90\u7684\u9884\u671f\u8ddd\u79bb<\/li>\n\n<li>\u73af\u5883\u566a\u58f0\u5e95\u9650<\/li>\n\n<li>\u7cfb\u7edf ADC \u6216 DSP \u94fe<\/li>\n\n<li>\u5e94\u7528\uff1a\u8bed\u97f3\u5524\u9192\u3001\u8fdc\u573a\u6355\u6349\u6216\u964d\u566a<\/li><\/ul><p>\u5728 <strong><a class=\"\" href=\"https:\/\/sistc.com\/zh\/\">\u65e0\u9521\u7845\u6e90\u79d1\u6280\u6709\u9650\u516c\u53f8<\/a><\/strong>\u6211\u4eec\u5e2e\u52a9\u5ba2\u6237\u9009\u62e9\u548c\u96c6\u6210\u5177\u6709\u5b9a\u5236\u7075\u654f\u5ea6\u7ea7\u522b\u7684 MEMS \u9ea6\u514b\u98ce\uff0c\u786e\u4fdd <strong>\u66f4\u6e05\u6670\u7684\u97f3\u9891\u91c7\u96c6\u548c\u66f4\u597d\u7684\u7528\u6237\u4f53\u9a8c<\/strong>.<\/p><p>\ud83d\udce9 <a href=\"https:\/\/sistc.com\/zh\/contact-us\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u8054\u7cfb\u6211\u4eec\u7684\u5de5\u7a0b\u56e2\u961f<\/mark><\/a> \u7075\u654f\u5ea6\u8c03\u6574\u5efa\u8bae\u6216\u5b9a\u5236\u9ea6\u514b\u98ce\u6a21\u5757\u5f00\u53d1\u3002<\/p><h3 class=\"wp-block-heading\"><strong><strong>\u5185\u90e8\u94fe\u63a5\u53c2\u8003<\/strong><\/strong><\/h3><ul class=\"wp-block-list\"><li><a href=\"https:\/\/sistc.com\/zh\/product\/analog-mems-microphone\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u6a21\u62df MEMS \u9ea6\u514b\u98ce<\/mark><\/a><\/li>\n\n<li><a href=\"https:\/\/sistc.com\/zh\/product\/digital-mems-microphone\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u6570\u5b57 MEMS \u9ea6\u514b\u98ce<\/mark><\/a><\/li>\n\n<li><a href=\"https:\/\/sistc.com\/zh\/product\/smart-mems-microphone\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u667a\u80fd\u9ea6\u514b\u98ce\u6a21\u5757<\/mark><\/a><\/li>\n\n<li><a href=\"https:\/\/sistc.com\/zh\/en-blog-microphone-array-voice-recognition\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u8bed\u97f3\u8bc6\u522b\u5e94\u7528<\/mark><\/a><\/li><\/ul><h3 class=\"wp-block-heading\"><strong><strong>\u5916\u90e8\u8d44\u6e90\u53c2\u8003<\/strong><\/strong><\/h3><ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.analog.com\/en\/analog-dialogue\/articles\/microphone-sensitivity.html\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u6a21\u62df\u5668\u4ef6 - \u4e86\u89e3\u9ea6\u514b\u98ce\u7075\u654f\u5ea6<\/mark><\/a><\/li>\n\n<li><a href=\"https:\/\/signalprocessingsociety.org\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">\u7535\u6c14\u548c\u7535\u5b50\u5de5\u7a0b\u5e08\u5b66\u4f1a\u4fe1\u53f7\u5904\u7406\u534f\u4f1a<\/mark><\/a><\/li>\n\n<li><a href=\"https:\/\/www.edn.com\/tag\/mems-microphone\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">MEMS \u9ea6\u514b\u98ce\u8bbe\u8ba1\u8d44\u6e90 - EDN 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